Pg. 34-14 Step 4: Cut the ten plys of #1 through #5 from the 9 oz. / sq. yd. plain weave E-glass fabric using a rotary cutter. Piled in two sets of five plys. Step 5: Sanded the Canopy and Canopy Skirt with 80 grit sand paper until there was no gloss anywhere. Blew away the dust and debris with compressed air.